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1. Working principle and structure of the rope device
1.1 Principle
The working principle of the hoisting wire rope supporting device is as shown in Fig. 2. When the variable width trolley moves forward, the front car 3 is pushed, and the front car is pulled forward by the rope pulling rope 11 to pull the rope and the car 9 moves forward together. The hoisting wire rope on the rope carrier behind the pallet is lifted by the rope. Similarly, when the luffing car moves backwards, the car is pushed back, and the car is pulled backwards after the tether is pulled. The hoisting wire rope on the front carriage rope of the tether is lifted by the front car. . By adjusting the distance between the front of the pallet and the rear of the pallet, the maximum drape height of the hoisting rope can be minimized.
1.2 structure
The structure of the front and rear supporting device is the same. The supporting frame is welded by the steel and the steel plate. The two rollers are rolled on the upper surface of the lower chord of the lifting arm, and the elastic collision block is mounted on the frame before and after the roller. Under the frame, a roller with a nylon rod is installed.
2. The wearing method and adjustment method of the rope device
2.1 wearing a method
Place the pallet trolley in front of and behind the variable-speed trolley as shown in Figure 2. Lock one end of the traction rope of the pallet truck on the front axle (A) of the pallet, through the arm-point pulley, the pulley block on the boom, and the arm-anchor pulley. , the rear car of the rope, the variable speed car, and finally the other end of the wire rope is locked on the front car (B) of the rope.
2.2 adjustment method
Keep the front and rear of the rope at half the distance of the boom, and adjust the "A" on the front of the rope.
"B" wire rope clamp to adjust the tightness of the wire rope, and finally use two wire rope clamps to fix the rope rear car to the traction rope D of the rope car. When the rope is finished, the cart is operated several times before and after to check whether the system is operating normally.
In addition, it must be noted that the tow rope pulling rope should not interfere with the variable amplitude rope when passing through the trolley and the guide wheel of the variable speed trolley. When using the trolley, ensure that the elastic bumper is installed on the trolley and is not allowed to be installed on the variable speed trolley. However, when the trolley is not used, the elastic bumper must be installed on the variable speed trolley.
3, the conclusion
The rope-roping wire rope supporting device has achieved good results in the actual use of the large-scale horizontal variable-width tower crane in the East China Sea natural gas reserve project, reducing the height of the tower crane, saving construction costs and improving construction efficiency. The author believes that with the use of large-scale tower cranes in large-scale projects, this problem will increasingly attract the attention of the construction party, and the towline device will gradually be applied to large-scale tower cranes. At the same time, the author believes that the safety problems caused by preventing the sag of the hoisting wire rope should be considered in the revision of the corresponding hoisting machinery technical standards and safety standards.
Design and Application of Tower Crane Lifting Wire Rope Supporting Device
With the rapid development of China's economy, the construction of various high-rise buildings and engineering facilities is also increasing. With the construction of high-rise and super-tall buildings, the performance requirements and use requirements for tower cranes for construction are also increasing. Especially in large-scale construction projects, large tower cranes sometimes use several units, plus others. Construction machinery, a construction project can be completed with dozens of construction machinery. In this way, several large tower cranes are sometimes installed on the construction site. Due to the limitation of the space position, the working range of the tower cranes sometimes overlaps each other. In order to avoid mutual interference, the mutual lifting height is different. Thereby the boom is prevented from interfering with each other. However, since the booms of large horizontal turret cranes are generally long, generally reach 50m or more, and the longest can reach about 75m. The hoisting wire rope on the boom is drooping under the action of its own gravity. Due to the long boom, the hoisting wire rope of the large tower crane is relatively large in diameter, and its own weight is relatively large, sometimes the length of the sag reaches About 3m, under normal circumstances, it also reaches about 2m, as shown in Figure 1. Such a large sag length is likely to interfere with each other during construction, and sometimes interferes with the building. In order to prevent interference, the lifting height of the tower crane must be increased, and sometimes it is subject to the height rise of the tower crane itself. Restrictions on restrictions or attachment locations are difficult to achieve. And such interference is very dangerous and prone to safety accidents. Therefore, how to solve the problem of large horizontal turret tower crane construction is very necessary. Now I will introduce the structural principle and use of the hoisting wire rope support device designed for a large tower crane with an arm length of 74m.